/dev/fast
Open-source code review for understanding architecture, diffs, and agent trajectories.
Company research · 47 profiles
YC Winter 2026 companies
A selected Winter 2026 YC company sample organized for founders comparing adjacent products, buyers, and public evidence.
Ali Abouelatta
Cofounder of Lazyweb (a16z Speedrun). Previously grew subscriptions and built native ads at Duolingo. Writes First1000 (90,000+ subscribers).
Constellation Space
Constellation Space provides a telemetry, forecasting and policy-controlled action layer for mixed-vendor satellite fleets.
21st
21st.dev pairs a large React component registry with an Agents SDK for shipping persistent frontier-agent experiences to users.
Balance
Balance keeps SMB books current with AI agents and named accountants who own the judgement and sign-off.
Autumn AI
A live public-web research and enrichment layer for teams that need changing signals and provenance rather than static database rows.
AutoSitu
The AI operating system for the built world
Sitefire
AI-search visibility, content, citation, and referral analytics for marketing teams.
Bubble Lab
Bubble Lab turns event attendance and community operations into relationship context, matchmaking and recurring workflows.
Cofia
Cofia says it learns repetitive internal work from system events and proposes reviewed automations for tasks such as outreach, recruiting and reporting.
Perfectly
Perfectly applies recommendation-system thinking to recruiting, with an AI agent for sourcing, outreach and screening.
Caretta
A call-side sales intelligence layer whose value depends on technical objection volume, trusted source content and disciplined action controls.
Agentic Fabriq
The control plane for AI agents.
Burt
AI teammates that handle repetitive freight-broker tasks while escalating exceptions.
Doomersion
Doomersion uses a short-form video feed to make comprehensible language immersion more repeatable for mobile learners.
Fort
Fort targets strength-focused consumers with a screen-free wearable, training plans and a pre-order device/software offer.
CatchBack Cards
A collectible-pack and resale platform whose strongest trust claim is verifiable pack construction, while fulfillment and buyback terms remain the buyer’s diligence points.
Fenrock AI
Back-office AI agents for banks that work across existing systems and internal policies.
SpotPay
SpotPay targets cross-border consumers with one verified wallet, local/international transfers and a global card.
Copperlane
Copperlane presents Penny as an AI mortgage-intake assistant that turns borrower conversations and documents into reviewable loan files.
Panta
A licensed commercial brokerage for hard-to-place operators, with AI handling coordination while brokers retain coverage judgment.
Unifold
Multi-chain deposit and payment infrastructure
Beacon Health
EHR-native AI operations for primary-care and value-based-care organizations.
Prana
Prana combines free AI health chat, record/wearable monitoring and $39 human doctor visits in an early beta care model.
CellType
CellType describes an agentic drug company built on biological foundation models that simulate human biology for discovery and translational work.
Mango Medical
An early orthopedic planning partner whose value depends on traceable imaging-to-plan workflows, clinician review and regulatory progress.
ClaimGlide
AI automated prior-auths for private medical practices
ARC Prize Foundation
Open benchmarks, competitions, grants, and research community for general and agentic intelligence.
AxionOrbital Space
AxionOrbital targets continuous visibility for defense, disaster response and agriculture by turning SAR signals into usable optical imagery.
OctaPulse
OctaPulse targets manual fish-farm QA with vision-based grading, phenotyping and a path toward automated sorting and broader aquaculture operations.
DAIVIN!
A deep-tech breathing-equipment project whose tankless diving concept remains gated by independent safety validation, certification and fallback procedures.
Milliray
Technology to detect and track small drones
Condor Energy
Energy strategy software for large electricity consumers managing risk, cost, and investment.
10x Science
An early AI drug-development platform focused on the protein-characterization bottleneck between experimental data and candidate advancement.
Aemon
Aemon describes a forward-deployed research engineer that locks an eval, explores many approaches and returns validated technical improvements.
Ashr
Ashr helps teams turn production traces and corrections into eval sets, specialist models and continually improving model infrastructure.
Avoice
An architecture workspace connecting specs, QA/QC, delivery, practice operations, and project knowledge.
Booko
Dynamically pricing the whole economy.
Byteport
A large-file transport layer for teams that need measurable speed and reliability across high-latency, air-gapped or mission-critical networks.
Cajal
Cajal describes Tau and Lean-based formalization for applied mathematics, quantum computing, finance and AI research, alongside the Talos open-source interpreter.
Cardboard
Cardboard gives growth and marketing teams an agentic timeline editor for finding moments, making first cuts and shipping multi-format video.
Carrot Labs
AI Cost Management: Track and attribute AI spend across every provider
Chasi
An equipment-industry revenue and utilization layer for dealers that need faster response, less admin work and better fleet coordination.
Confluence Labs
An early research lab applying learning efficiency and program synthesis to domains where physical experiments are expensive and sparse.
Envariant
Envariant positions its interpretability SDK as an upstream control layer for foundation-model hallucinations, invariants, steering and edge cases.
InventoryQuant
InventoryQuant automates contents inventories, replacement pricing and report formatting for adjusters and insurance operations.
Jinba
Chat-built enterprise workflow automation with visual review, APIs, MCP, governance, and on-prem options.
Lance
AI Agents That Run Hotel Operations.
How this collection was assembled
Includes all of our approved published profiles with recorded Y Combinator Winter 2026 membership. This remains a researched subset of the public program roster, not a complete intake list or a quality ranking.
- https://www.ycombinator.com/companies?batch=Winter%202026
- https://www.ycombinator.com/companies
- https://www.ycombinator.com/companies/devfast
- https://www.ycombinator.com/companies/constellation-space
- https://www.ycombinator.com/companies/21st
- https://www.ycombinator.com/companies/getbalance
- https://www.ycombinator.com/companies/autumn-ai
- https://www.ycombinator.com/companies/autositu
- https://www.ycombinator.com/companies/sitefire
- https://www.ycombinator.com/companies/bubble-lab